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Annotation of OpenXM_contrib/gmp/mpn/arm/submul_1.asm, Revision 1.1

1.1     ! ohara       1: dnl  ARM mpn_submul_1 -- Multiply a limb vector with a limb and subtract the
        !             2: dnl  result from a second limb vector.
        !             3: dnl  Based on mpn_addmul_1, which was contributed by Robert Harley.
        !             4:
        !             5: dnl  Copyright 1998, 2000, 2001 Free Software Foundation, Inc.
        !             6:
        !             7: dnl  This file is part of the GNU MP Library.
        !             8:
        !             9: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: dnl  it under the terms of the GNU Lesser General Public License as published
        !            11: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            12: dnl  your option) any later version.
        !            13:
        !            14: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: dnl  License for more details.
        !            18:
        !            19: dnl  You should have received a copy of the GNU Lesser General Public License
        !            20: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: dnl  MA 02111-1307, USA.
        !            23:
        !            24: include(`../config.m4')
        !            25:
        !            26: C This runs at 9.75 cycles/limb in the StrongARM.
        !            27:
        !            28: C Could use some register cleanup.  Some fewer registers might be needed, or
        !            29: C r11 could be utilized for better speed.  Could avoid saving all registers for
        !            30: C small (n <= 3) operands.
        !            31:
        !            32: define(`rp',`r0')
        !            33: define(`up',`r1')
        !            34: define(`n',`r2')
        !            35: define(`v',`r3')
        !            36:
        !            37: ASM_START()
        !            38: PROLOGUE(mpn_submul_1)
        !            39:        stmfd   sp!, { r4-r10, lr }
        !            40:        mov     r4, #0
        !            41:        movs    n, n, lsr #1
        !            42:        bcc     L(skip1)
        !            43:        ldr     lr, [up], #4
        !            44:        umull   r4, r12, v, lr
        !            45:        ldr     r6, [rp]
        !            46:        subs    r6, r6, r4
        !            47:        sbc     r4, r0, r0
        !            48:        sub     r4, r12, r4
        !            49:        str     r6, [rp], #4
        !            50: L(skip1):
        !            51:        movs    n, n, lsr #1
        !            52:        bcc     L(skip2)
        !            53:        ldmia   up!, { r9, r10 }
        !            54:        mov     r5, #0
        !            55:        umlal   r4, r5, v, r9
        !            56:        mov     r9, #0
        !            57:        umlal   r5, r9, v, r10
        !            58:        ldmia   rp, { r6, r7 }
        !            59:        subs    r6, r6, r4
        !            60:        sbcs    r7, r7, r5
        !            61:        sbc     r4, r0, r0
        !            62:        sub     r4, r9, r4
        !            63:        stmia   rp!, { r6, r7 }
        !            64: L(skip2):
        !            65:        teq     n, #0
        !            66:        beq     L(return)
        !            67:
        !            68: L(submul_loop):
        !            69:        ldmia   up!, { r9, r10, r12, lr }
        !            70:        mov     r5, #0
        !            71:        umlal   r4, r5, v, r9
        !            72:        mov     r9, #0
        !            73:        umlal   r5, r9, v, r10
        !            74:        mov     r10, #0
        !            75:        umlal   r9, r10, v, r12
        !            76:        mov     r12, #0
        !            77:        umlal   r10, r12, v, lr
        !            78:        ldmia   rp, { r6, r7, r8, lr }
        !            79:        subs    r6, r6, r4
        !            80:        sbcs    r7, r7, r5
        !            81:        sbcs    r8, r8, r9
        !            82:        sbcs    lr, lr, r10
        !            83:        sbc     r4, r0, r0
        !            84:        sub     r4, r12, r4
        !            85:        subs    n, n, #1
        !            86:        stmia   rp!, { r6, r7, r8, lr }
        !            87:        bne     L(submul_loop)
        !            88: L(return):
        !            89:        mov     r0, r4
        !            90:        ldmfd   sp!, { r4-r10, pc }
        !            91: EPILOGUE(mpn_submul_1)